Machine



2 Sheets-Sheet 1.

(No Model.) Q

1:. 0. 11001111111. BURNISHING MACHINE. v No. 601,461. Patented Mar. 29,1898.

Inventor.

W Attorney.

(No Model.) 2 SheetS- Sheet 2.

' E. C. DOOLITTLE.

' BURNISHING MAGHINE. 7

No. 601,461. Patented Mar.'29, 1898.

e? 'mml L 62mm; 3 A J UNITED STATES ATENT FFICE.

ELBRIDGE C. DOOLITTLE, OF PHILADELPHIA, PENNSYLVANIA,"ASSIGNOR OF ONE-HALF, TO ALFRED R. JUSTICE, OF SAME PLACE.

BURNISHING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 601,461, dated March 29, 1898.

Application filed June 18, 1897. Serial No. 641,299. (No model.)

To all whom it may concern.-

Be it known that LELBRIDGE C. DOOLITTLE, a citizen of the United States, residing at the city and county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Burnishing-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, of which Figure 1, Sheet 1, is a plan View. Fig. 2 is a detail in elevation, broken away, showing the switch-block for raising the nut-piece carried by the moving table out of engagement with the threaded shaft. Fig. 3 is an elevation of the said nut-piece removed. Fig. 4, Sheet 2, is a vertical section, as on line a: m, Fig. 1. Fig. 5 is a front elevation. Fig. 6 is an elevation of a form of burnishing -tool such as shown in Figs. at and 5, but showing the bloodstone tip thereof inclined to the shank of the tool. Fig. 7 is an elevation of a modified form of burnishing-tool and holder.

This invention relates to machines for burnishing plane surfaces of silverware or the 1ikesuch as waiters, trays, &c.and has for its object the production ofa machine of the kind which shall be automatic in its operation of causing the burnishing-tool to regularly and gradually traverse the surface to be operated upon.

A leading feature of the invention consists in the combination, with a suitable holder for the burnishing point or head, usually a bloodstone, of a sliding support or table for the article to be burnished, means for reciprocating said point as it bears upon the surface of the article, and means for imparting to the said support-that is, in effect, to the article to be burnished-a gradual movement in a direction at an angle to that of the reciprocatory movement of the burnishing-point.

Other features relate to certain details of construction and combinations of mechanism for the attainment of the object of the invention in the best and simplest manner, as hereinafter described and duly pointed out.

Referring to the accompanying drawings,

forming a part of this specification, 1 is the frame that supports the mechanism of the machine.

2, Figs. 1 and 4, is the main or driving shaft, that is journaled in bearings of posts 1* of the frame and is driven from a source of power.

3 is a second shaft, also journaled at each end in bearings of the frame and is adapted to be driven by a belt 4:, Fig. 1, running over pulleys 5 and 6 on the ends of shafts 2 and 3, respectively. A part of the shaft 3 is screwthreaded, as shown. 7

7 is a horizontal table or support having legs 8, whose free ends rest upon guide-rails 9 of the frame in a manner to permit the said legs to slide longitudinally upon the rails. At the end of the table toward the threaded part of shaft 3 is a forward extension 10, having a vertical slot 11 therein that is adapted to receive a bar 12, which I term the nutpiece, whose lower end at 13 is semicircular and is screw-threaded to correspond with the threads of the shaft 3, whereby when the nutpiece is in place within the slot its thread ongages that of the shaft.

Adjacent to the outer end of the threaded part of shaft 3 is a clamp-yoke 14, that is sethe table 7, to which it is suitably held-as,

for instance, by means of clamp-yokes 17, whose end limbs engage the edge of the table and are held thereto by thumb-screws 18.

On the end of the main shaft 2 is a crank 19, to which is pivotally secured a jointed horizontal bar 20, that is adapted to slide in a guideway 21 of a post 22 of the frame. The rotation of the shaft imparts a horizontal re; ciprocatin g motion to the bar. I usually con-j nect the said bar with the crank in'such man-- ner that the same may be adjusted so-that' crank. The free end of the bar carries the I holder 26 of the bloodstone 27 or other suitable burnishing-point. tically adjustable, it being held between jaws 28 of the bar and clamped and released bya thumb-screw 29. In this way the bloodstone may be adjusted to suit the elevation of the and hold it at the desired elevation bymeans of a set-screw 30. It also is sometimes desirable to have the bloodstone bear yieldingly upon the article, in which case Idisp'ense with the set-screw 30 and employ a suitable spring to bear upon the pivoted part which carries the holderas, for example, a flatf spring 31., one :end of which is secured to the bar and the other end bears upon the top of By means of .a screw i the said pivoted part. I 32 the tension or pressure of the spring may be regulated as desired. It istalsosometimes E desirable lto change the bearing or working,-

This holder is ver point of the bloodstone, and to this en-d1 secure the same to a piece 33, that is pivotedona pin 34 to the holder 26, whereby the} 'bloodstone may be moved laterally in the are of a circle, .astseen in Fig. 6..

Having now described the construction, I 1

shall proceed to describe the mode of operation of the mechanism.

placed upon and clamped to table 7, the latter being then in such position that the line of the bar 20tand of the bloods-tone is near to 1 the inner end of the tray that .is toward (the threaded part of the shaft .3, the stone resting upon the top of the trayat the edgeofj the ,part of the latter ;'to be operated upon. I The main shaft is put in motion inthediirection of the arrow in Figs. land .4, and thus reciprocates bar 20 and at the same time,

through the'Lbelt 4, drives the .threadedshaft 3.

"The rotation .of the lat'terby reasonof the nut-piece connecting .the shaft and the table causes the latterltograduailyadvance at the samet'ime that the bloodstonereciprocates across the surface of the tray. It will of course 'be understood thatlthe pitch of the screw-threads of said's'ha'ftand nut-,pieceand the relative speeds (of rotation .of saidshaftv and the dniving-shaiitaresuch that the movement of the tableand trayshallnohsowto say,

beahead of the 'traverseof the 'bloodstone,

and thus the entire surface of the tray will be burnished. As the machine continues thus in operation thenu't-piece finally-reaches the incline 16, and then riding upon it is thereby pushed upwardly and becomes .disengaged from the screw-thread of shaft The machine is .now stopped. Thetrayisremoved. The table 'is .s'l-id back to the roriglinal ,pos'i'tion ready to receive a secondtrayor the like, the nut-,piece beingalso returnedto its original position in engagement with the threads of shaft of the table may be varied as desired by shitting the yoke Hand consequently the incline. If the threads of the latter are square, the nut-piece will usually remain in such engagement; but in order to insure against disengagement I prefer to use a suitable spring whose free end bears against the top of the nut-piece.

In order to Vary or adjust the speed of rotation of the shafts, I make use of nests of pulleys of different diameters thereon in the usual way, as shown.

I propose to sometimes use two bloodstones, the one following the other in traversing the surface of the article being burnished. In such case I would employ the construction shown in Fig. 7-that is, I extend from each side of 1a vertical-rod 2.6%, that takes the place of the holder 26, :an Jar-r1136 and connect to each armla holder 37 for abloodstone 38., and in order to cause the stones to bearevenly upon the surface to be burnished I would use flatsprings39, (sin1ilar to the afioresaidspring 35 whose freeends bear upon the topsof the holders, which latter are adapted to slide freely in slots in the said arms.

.ldo-not limit myself to the particularconstruction-or devices herein-before described, as thesame may be readily varied within-cer- 'tain limits by those skilled in the art towhich the inventionpertains without departing from "Ilhe tray T for thelike to be burnished is the essential principle thereof.

Having thusdescribeditheconstruction and modes 'operandi of my invention, 1 claim as new and desire to secure by Letters Patent .1. In :a .bru rnishing-machi-ne, the combinationof the banthe burnishing-tool carried thereby, thes-lidin-g'talble or support forrsupporting the :article to be operated upon, the

screw-threadedshaft-disposed.at an angle to l 5 said bar, a nutcon-nected to said table .and

engaging said shaft,m eans for reciprocating said bar, and .means tor rotating said shaft, whereby at the same time that the bar is caused to reciprocate with relation to said table, the latter is caused to advance with suitable relation to the movementof the bar, substantiallyas and for the'purposeset forth.

In .a sburnishingfimachine, the combinagt'i-onof the driying-shaft, the crank thereon, thesliding bar piuotal lyconnected to the latter, means for securing a bloodstone or'other suiitable 'burnishing-tool, to the free end-of said bar, the sliding .table or support for holdingthearticleto beoperated upon, thethreaded shaft driven from the said driving-shaft, and the nuteconnecting said shaft and table, 231]. constructed and adapted to o erate sub- ,s'tantiallyas and :for the purpose set forth.

The combination of the table, the rotatable screw-threaded shaft, the verticallymovable nut piece,-connecting the table and shaft, and the incline adapted to force the nutpieceout of engagement with the said shafit, substantiallyas and tor the purpose specified. It will be obvious that the extent of travel 4. The combination of the sliding table mounted upon suitable guideways, the screw- In testimony whereof I have hereunto afthreaded driven shaft, the nut-piece adapted fixed my signature in the presence of two sub- 10 to slide in a slot in said table, the incline scribing witnesses. adapted to engage said nut-piece and elevate 1 5 the same out of engagement with said shaft, ELBBIDGL DOOLITTLE' together with means for adjusting the incline Witnesses: with relation to the shaft and table, substan WALTER O. PUSEY, tially as and for the purpose described. JOSHUA PUSEY. 

